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Petrol Rotary Self Propelled Lawnmowers

Our 4 wheel petrol self-propelled lawnmowers take the effort out of mowing larger or sloped lawns, with the engine driving the wheels so you just guide the machine. Choose from Cobra, Masport, Harry, and Webb self-propelled petrol mowers, with cutting widths from 40cm up to 52cm and models suited to lawns from around 250m² up to 1200m². Many feature 4-in-1 functionality (collect, mulch, discharge, and side-discharge) and variable speed drive, giving you control over pace and finish across different areas of the garden. All orders come with free UK delivery, our 90-day money-back guarantee and price match promise.

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HARRY LMG42S-B

£229.00

Save 17%

HARRY LMG46S-B 18″ Single-Speed Self-Propelled Petrol Mower

Original price was: £328.99.Current price is: £274.00.

Save 15%

Harry LMG53SHL-C 52cm / 21″ Self-Propelled Petrol Mower

Original price was: £429.00.Current price is: £365.00.

Save 17%

HARRY LMG53SHL-T

Original price was: £430.99.Current price is: £359.00.

Frequently Asked Questions

How does a self-propelled petrol lawnmower work?

The engine drives the rear or all four wheels, pulling the mower forward so you only need to steer and control the pace, rather than push the full weight of the machine. This makes mowing significantly less tiring on larger lawns or uneven ground.

Do I need a self-propelled mower for a sloped garden?

Yes, generally — self-propulsion makes a real difference on slopes, as you're not fighting the mower's weight uphill. Look for models with variable speed drive so you can slow down on inclines and speed up on flatter areas.

What does 4-in-1 mean on a self-propelled lawnmower?

A 4-in-1 mower can collect grass in the box, mulch clippings back into the lawn, discharge them out the back, or side-discharge, letting you switch cutting mode depending on grass length and season without buying separate attachments.

Is a self-propelled petrol mower harder to maintain than a push mower?

Self-propelled models have a drive belt and transmission system in addition to the standard engine maintenance, so there's slightly more to check over time. Routine care — oil changes, air filter cleaning, and blade sharpening — is otherwise the same as any petrol mower.

What size lawn needs a self-propelled petrol mower?

As a guide, self-propulsion becomes genuinely useful from around 500m² upwards, and is close to essential above 800m²-1000m², where the reduced physical effort makes a noticeable difference to mowing time and comfort.

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Our Promise

90 day guarantee

Changed your mind? Just let us know within 90 days—as long as the item’s unused, in original packaging, and you have your order or invoice number, we’ll sort it. Email us to arrange the return. Once we’ve received and checked the item, we’ll refund you to your original payment method.

Price match promise

At Mowers‑Online, we want you to get the best deal. If you spot the exact same product for less elsewhere, just email us the details—and we’ll match the price. It’s simple, fair, and designed to save you money.

Finance available

Changed your mind? Just let us know within 90 days—as long as the item’s unused, in original packaging, and you have your order or invoice number, we’ll sort it. Email us to arrange the return. Once we’ve received and checked the item, we’ll refund you to your original payment method.
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